321183296561 has 2 divisors, whose sum is σ = 321183296562. Its totient is φ = 321183296560.

The previous prime is 321183296557. The next prime is 321183296563. The reversal of 321183296561 is 165692381123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308869177600 + 12314118961 = 555760^2 + 110969^2 .

It is a cyclic number.

It is not a de Polignac number, because 321183296561 - 2² = 321183296557 is a prime.

Together with 321183296563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321183296563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160591648280 + 160591648281.

It is an arithmetic number, because the mean of its divisors is an integer number (160591648281).

Almost surely, 2^321183296561 is an apocalyptic number.

It is an amenable number.

321183296561 is a deficient number, since it is larger than the sum of its proper divisors (1).

321183296561 is an equidigital number, since it uses as much as digits as its factorization.

321183296561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The spelling of 321183296561 in words is "three hundred twenty-one billion, one hundred eighty-three million, two hundred ninety-six thousand, five hundred sixty-one".